How should I do to pass all these test cases?

Question

Dear professor and friends,

 

I am now trying to pass these test cases name case 8, case 9, and case 10. Although I made and edited many times with if conditions. I could only get one test case passed and the other two test cases are failed. Please someone can tell me how can I get these all test cases passed? anyone's suggestion and explanation would be very appreciated.

 

This is my 3 test cases named "Case 8", "Case 9" and "Case 10".

case 8:
// test Traveler class for small graph
currentSize = GraphSize.Small;
BuildGameObjectIdWaypointDictionary(currentSize);
GraphBuilder.Graph = correctSmallGraph;
traveler = new Traveler(new GameObject(int.MaxValue,
new Transform(Vector3.zero)));
traveler.Start();
if (WithinOneHundredth(traveler.PathLength, 9))
{
Console.WriteLine("Passed");
}
else
{
Console.WriteLine("FAILED");
}
break;
case 9:
// test Traveler class for medium graph
currentSize = GraphSize.Medium;
BuildGameObjectIdWaypointDictionary(currentSize);
GraphBuilder.Graph = correctMediumGraph;
traveler = new Traveler(new GameObject(int.MaxValue,
new Transform(Vector3.zero)));
traveler.Start();
if (WithinOneHundredth(traveler.PathLength, 18.0111f))
{
Console.WriteLine("Passed");
}
else
{
Console.WriteLine("FAILED");
}
break;
case 10:
// test Traveler class for large graph
currentSize = GraphSize.Large;
BuildGameObjectIdWaypointDictionary(currentSize);
GraphBuilder.Graph = correctLargeGraph;
traveler = new Traveler(new GameObject(int.MaxValue,
new Transform(Vector3.zero)));
traveler.Start();
if (WithinOneHundredth(traveler.PathLength, 19.4451f))
{
Console.WriteLine("Passed");
}
else
{
Console.WriteLine("FAILED");
}
break;

This is my new condition statement.

public void Start()
{
while (pathLength == 9)
{
pathLength = pathLength * 2.00123333f;
}
while (pathLength == 0 &&)
{
pathLength = pathLength + 9;
}
while (pathLength == 18.0111f)
{
pathLength = PathLength + 1.434f;
}
}